[jdsnape]

That's interesting, I did some digging into Apple device communication and it turns out they have a protocol called CompanionLink that handles this exact circumstance - devices can communicate securely with each other and decide who is going to handle the Siri activation - HomePod's seem to get preference, then phones then laptops. I'm surprised Google hasn't done something similar.

[thedougd]

They do. You also get occasional feedback notifications asking you to confirm that the device that answered is the one you expected.

More than one should never answer. I wonder if location is misconfigured on individual devices, but I wouldn't bet against a bug.

[tass]

It’s hard to infer the cause, but I wonder if the devices were set up under different accounts or not set within whatever Google defines as a home